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I've been doing some research and I've come across the OEM Z4 3.0i sound generator. On youtube there are a few videos of e46's that have this mod done. I don't know if you know what its all about, but basically it filters engine noise into the cabin. From my understanding it is a part that comes off of our intake and attaches to the firewall, thus allowing an entry way into the cabin for the engine noise. Here is a thread from someone installing this part off of the 3.0i onto his Z4 2.5.

It can obviously BE done since there are numerous videos of it in action on an e46 out there, but I'm just wondering if anybody has thought of, or has already done this mod. Maybe we can stop getting people with $30.00 cone filters with no heat shield from coming around to get this engine note.

Snowskateskate- Then wait till you get home and listen to it on speakers. Its not dumb.

Alpine- Why? What about this idea turns you off. Its OEM on a Z4.

Silver- Listen to the youtube video? You think that sounds bad?

Jcns - I was not aware they had that part.

I seriously can't understand why you guys all think its the worst idea ever. It sounds pretty cool and its a god damn OEM part.

Just got home and listened to it. The sound quality is pretty bad....

Having a loud exhaust or engine is one thing, but cars pride themselves on how much they can keep interior cabin noise down. I don't want to have to yell when I talk to my passengers, or have to crank my music all the way up. This is a BMW; I atleast want SOME luxury. Is the luxury of having a relaxed, comfortable, quiet cabin unappealing to you?

Having a loud exhaust or engine is one thing, but cars pride themselves on how much they can keep interior cabin noise down. I don't want to have to yell when I talk to my passengers, or have to crank my music all the way up. This is a BMW; I atleast want SOME luxury. Is the luxury of having a relaxed, comfortable, quiet cabin unappealing to you?

I hear you. I understand the point too about the quiet cabin too. Yes the sound is poor quality but if you listen to the z4 videos of great quality, its really audible. I just feel like its a really nice touch, not obnoxious to where you would have to yell at your passengers. Otherwise why would they put it inside a z4? Obviously every 3.0i owner doesn't have to yell at their passengers. In fact, they report to taking out the foam insert to make the effect even more noticeable. I don't know, maybe I'll just pioneer this project its a 92$ part.